To determine the distance between two points without having to calculate it, on the Home tab, in the
Common group, click
Measure distance, select
Distance from the drop-down list to display the
Measure Distance window.
The Perpendicular To function allows the user to draw a dimension from a graphically selected point perpendicular to a selected line or plane in the 3D model.
The Show linear dimension option enables or disables display of the dimension line that goes directly between the two selected points, leaving only the orthogonal dimension lines displayed.